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By moving the keyboard accessory to chrome/browser, the following work
for the new manual UI will be simplified by a large margin:
 - The entry point for the fallback sheet can be added directly
 - Buttons as needed for password generation can be added
 - styles can be unified by using default resources

This CL mainly moves the files and modifies BUILD files accordingly.
Only colors have changed to similar-looking colors that are already
defined in Chromium (which is unproblematic this component is not
user-facing yet and its final visuals are far from done).

Bug: 828832
Change-Id: I6e9b9c9902468c010f72b717fd24de0bd81953af
Reviewed-on: https://chromium-review.googlesource.com/995415Reviewed-by: Theresa <twellington@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Commit-Queue: Friedrich Horschig <fhorschig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548747}